Increase air intake
The modified mushroom head can significantly increase the air intake (about 50%), but you may not be able to fill up the gas tank and so on.
This is because the mixture becomes thinner after increasing the intake. The carburetor should be adjusted appropriately according to the condition of the vehicle. The mixture screw can be fine-tuned to adjust the mixture ratio at low speed, and then the oil needle can be adjusted to adjust the mixture ratio at high speed to make the mixture concentration normal.
General car ignition control Angle is small, the obvious problems is the high speed vibration easily, shivering, the Angle of the modified better large igniter (preferably 0 to 35 degrees full speed control, I now anyway, is not found), and to be nice with spark plugs, it is recommended to use NGK iridium gold or platinum plugs, because iridium plug ignition needle can be done more fine, so sparks will be stronger, of course, also can achieve the goal of more fuel-efficient.
From iridium plug, of course, this work can tell, the effect also didn't have to say, of course, good spark plug can make the combustion more sufficient, the power is, of course, also will increase at the same time, conditional word can be modified at the same time good quality point resistance small high pressure cap and point firewire, such as extreme off-road vehicles such as modified using carbon core of the class, so the effect will be better, high-speed rotating stall can solve problems such as oil.
Modification of large-caliber carburetor
The first is to change the carburetor with a larger diameter, the second is to optimize the main orifice of the existing carburetor (appropriately increase), optimize the main oil needle of the carburetor (re-polish the oil supply curve), and finally adjust the mixing ratio to change the air filter with large flow. So the engine is basically fine, the engine can increase the power at least 15 to 20 percent, but these improvements are not enough, the transmission ratio has to be changed.
If you have enough money, you can retrofit a large carburetor, but then you have to replace something else at a higher cost. For example, a carburetor of 28 or 30 costs about 300 yuan, but the effect is perfect, the speed is much faster. The carburetor interface that goes with it needs to be better, not cheaper.
Modified exhaust system
Refit exhaust increase intake, exhaust should also do appropriate refit, so as to make the exhaust gas smoothly discharged, and not to form a bottle of strength, specific refit method every car is not quite the same, the best to find a professional repair shop to let professionals carry out refit.
Replace the sprocket and chain
The simple way is the engine small sprocket wheel for a bit larger, generally increase two teeth can, (for the rear teeth disc more trouble), so that you will reduce the low speed vibration, and then the engine power to play normal, speed will improve, of course, climbing ability will be reduced.
If the small sprocket vibration reduction is not obvious, you can use the method of changing the back teeth disc, generally changing the back teeth disc is six teeth smaller than the original car, the effect will be significantly better.
If it is the shaft drive and oil seal chain model, please ignore, a good chain is to ensure the engine normal power drive rear wheel important factor!
The chain friction is too serious, insufficient lubrication, before and after the sprocket wheel is not in a straight line so that the power of the engine can not get normal play, can choose the work of a better thickening chain, with o-type seal ring oil chain is the best effect of the chain now there are imperfect places please add and correct.
Reduce body weight
Minimize clutter in your car, which will reduce vibration and increase speed accordingly. It's not necessary to fill up the tank if you're not running a long distance at the pump. If you're lugging a full tank of gas around every day, you'll certainly get more gas mileage and you'll certainly get less speed.
Of course, if the rider's weight is too fat, can thin down, the speed of the motorcycle is also a certain enhancement, ha ha.
The tire pressure should be right
Maintain normal tire pressure, the summer time not too big, the top is too calendar harm, buttocks uncomfortable, also easy to burst the tire, of course not too small, too little friction is too big, the engine can be laborious, the air pressure adjustment to the right state is very necessary.
Some small displacement of the car if there are conditions to change the premise, increase the cylinder will of course increase the power, such as 125 to 150 cylinder and so on
Like some cars before the tire is relatively thick, such as prince car, can be changed to a little bit thinner, will reduce the friction force when the drive, will also make the acceleration more obvious, speed up.
Increase compression ratio and burnish inlet
There are many ways to increase the compression ratio, can be surfacing cylinder head, can change the pointed piston, can change the ultra-thin cylinder pad. Among them, change ultrathin cylinder cushion is the safest, but the effect is also the worst, suit the mo you that does not have refit experience to undertake trying.
As for the principle of polishing the inlet, the inner wall of the inlet is rough for some small displacement cars in China. When the mixture enters the inlet, there will be a certain amount of combustible gas attached to the inlet. When the inlet is smooth, fuel efficiency can be improved, thus improving performance and reducing fuel consumption. Grinding the inlet requires patience!
Change transmission ratio
Drive ratio can change tooth, but change tooth dish to want to pay attention to a few points, do not covete too much, for instance motorcycle original car proportion is front 14 hind 45 can change the test of 42 tooth first behind, if do not wish to test, can according to the following data reference.
Cg125 can try the first 17 after 42 or the first 15 after 37(the former works well, if you want to improve the speed can use the first 17 after 39);
Gs125 can be combined with the dental disc of 15, 42, 13, 38, 14 and 42.
Ybr125 can be combined with the first 16, the last 45, the first 14 and the last 42.
The 250 car can be tested in engine form to amplify the transmission ratio.